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-rw-r--r--Documentation/filesystems/Locking2
-rw-r--r--Documentation/filesystems/vfs.txt8
-rw-r--r--fs/block_dev.c1
-rw-r--r--fs/inode.c4
-rw-r--r--fs/libfs.c14
5 files changed, 23 insertions, 6 deletions
diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index 7b20c385cc02..dac435575384 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -52,7 +52,7 @@ prototypes:
int (*rename) (struct inode *, struct dentry *,
struct inode *, struct dentry *, unsigned int);
int (*readlink) (struct dentry *, char __user *,int);
- const char *(*get_link) (struct dentry *, struct inode *, void **);
+ const char *(*get_link) (struct dentry *, struct inode *, struct delayed_call *);
void (*truncate) (struct inode *);
int (*permission) (struct inode *, int, unsigned int);
int (*get_acl)(struct inode *, int);
diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index 761c6fd24a53..57fc576b1f3e 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -3,8 +3,6 @@
Original author: Richard Gooch <rgooch@atnf.csiro.au>
- Last updated on June 24, 2007.
-
Copyright (C) 1999 Richard Gooch
Copyright (C) 2005 Pekka Enberg
@@ -465,6 +463,12 @@ otherwise noted.
argument. If request can't be handled without leaving RCU mode,
have it return ERR_PTR(-ECHILD).
+ If the filesystem stores the symlink target in ->i_link, the
+ VFS may use it directly without calling ->get_link(); however,
+ ->get_link() must still be provided. ->i_link must not be
+ freed until after an RCU grace period. Writing to ->i_link
+ post-iget() time requires a 'release' memory barrier.
+
readlink: this is now just an override for use by readlink(2) for the
cases when ->get_link uses nd_jump_link() or object is not in
fact a symlink. Normally filesystems should only implement
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 500aaa3e5990..f80045048bb7 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -30,7 +30,6 @@
#include <linux/log2.h>
#include <linux/cleancache.h>
#include <linux/dax.h>
-#include <linux/badblocks.h>
#include <linux/task_io_accounting_ops.h>
#include <linux/falloc.h>
#include <linux/uaccess.h>
diff --git a/fs/inode.c b/fs/inode.c
index 16b10e53292e..e9d18b2c3f91 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1613,7 +1613,7 @@ EXPORT_SYMBOL(bmap);
* passed since the last atime update.
*/
static int relatime_need_update(struct vfsmount *mnt, struct inode *inode,
- struct timespec now)
+ struct timespec64 now)
{
if (!(mnt->mnt_flags & MNT_RELATIME))
@@ -1714,7 +1714,7 @@ bool atime_needs_update(const struct path *path, struct inode *inode)
now = current_time(inode);
- if (!relatime_need_update(mnt, inode, timespec64_to_timespec(now)))
+ if (!relatime_need_update(mnt, inode, now))
return false;
if (timespec64_equal(&inode->i_atime, &now))
diff --git a/fs/libfs.c b/fs/libfs.c
index 9efb647917e0..4b59b1816efb 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -1169,6 +1169,20 @@ simple_nosetlease(struct file *filp, long arg, struct file_lock **flp,
}
EXPORT_SYMBOL(simple_nosetlease);
+/**
+ * simple_get_link - generic helper to get the target of "fast" symlinks
+ * @dentry: not used here
+ * @inode: the symlink inode
+ * @done: not used here
+ *
+ * Generic helper for filesystems to use for symlink inodes where a pointer to
+ * the symlink target is stored in ->i_link. NOTE: this isn't normally called,
+ * since as an optimization the path lookup code uses any non-NULL ->i_link
+ * directly, without calling ->get_link(). But ->get_link() still must be set,
+ * to mark the inode_operations as being for a symlink.
+ *
+ * Return: the symlink target
+ */
const char *simple_get_link(struct dentry *dentry, struct inode *inode,
struct delayed_call *done)
{